SM Multi outdoor DM16-01.01.11-01en - Doming › cms_upload › catalog › product_files › 2069995_se… · Service manual DM16-01.01.11-01en 4 Multi DC inverter R410A. Outdoor

SERVICE MANUAL MIDEA AIRCONDITIONER

SUPER DC INVERTER MULTI TYPE

OUTDOOR UNITS

M2OE-14HFN1-Q M2OF-18HFN1-Q M3OE-21HFN1-Q M3OE-27HFN1-Q M4OE-28HFN1-Q M4OB-36HFN1-Q M5OE-42HFN1-Q

DM16-01.01.11-01en

Service manual DM16-01.01.11-01en

2 Multi DC inverter R410A. Outdoor unit

CONTENTS

1. GENERAL INFORMATION OF OUTDOOR UNITS .................................................................... 3

2. FEATURES........................................................................................................................................... 4

3. SPECIFICATION ................................................................................................................................ 5

4. DIMENSIONS .................................................................................................................................... 10

5. REFRIGERATION CYCLE DIAGRAM ........................................................................................ 11

6. WIRING DIAGRAM ......................................................................................................................... 13

7. INDOOR UNITS COMBINATION ................................................................................................. 16

8. SOUND LEVELS ............................................................................................................................... 18

9. INSTALLATION DETAILS ............................................................................................................. 19

10. ELECTRONIC CONTROL FUNCTION ..................................................................................... 29

11. TROUBLESHOOTING .................................................................................................................. 34

DM16-01.01.11-01en Service manual

Multi DC inverter R410A. Outdoor unit 3

1. General information of Outdoor Units Model name Dimension (mm)

M2OE‐14HFN1‐Q 800x333x554

M2OF‐18HFN1‐Q 800x333x554

M3OE‐21HFN1‐Q 845x363x702

M3OE‐27HFN1‐Q 845x363x702

M4OE‐28HFN1‐Q 946x410x810

M4OB‐36HFN1‐Q 946x410x810

M5OE‐42HFN1‐Q 946x410x810



2. Features

The hydrophilic fin can improve the heating efficiency at operation mode.

It protects the valves and prevents water from dripping.

4 way valve control

It is only operated in the heating operation mode except defrosting operation.

Outdoor unit

Power relay control

Hydrophilic aluminum fin

Anti-rust cabinet

Valve protection cover

Low noise air flow system

Discharge pipe temperature protection



3. Specification Outdoor Model M2OE-14HFN1-Q M2OF-18HFN1-Q

Indoor unit combination Single Double Single DoublePower supply V-ph-Hz 220-240V- 50Hz, 1Ph 220-240V- 50Hz, 1Ph

Cooling

Capacity Btu/h 7000-14000 14000 7000-18000 18000 Input W 660-1250 1200 650-1600 1643 Rated current A 2.9-5.4 5,2 2.8-7.0 7,1 EER W/W / 3,30 / 3,21

Heating

Capacity Btu/h 8000-15000 15000 7000-19000 19000 Input W 620-1280 1160 542-1596 1543 Rated current A 2.7-5.6 5 2.3-6.9 6,7 COP W/W / 3,80 / 3,61

Max. input consumption W 2000 2600 Max. input current A 11 14

Compressor

Model ASN108D22UEZ ASM135D23UFZ Type ROTARY ROTARY Brand GMCC GMCC Capacity Btu/h 10987 13836 Input W 825 1035 Rated current(RLA) A 5,8 7.32 Locked rotor Amp(LRA) A / ---- Thermal protector position / ---- Capacitor μF / ---- Refrigerant oil ml ESTER OIL VG74 370 ESTER OIL VG74/450

Outdoor fan motor

New Model ZKFN-40-8-1L ZKFN-40-8-1L Model Qty 40(Output) 40(Output) Output W / / Capacitor μF / / Speed(Hi/Med/Lo) r/min 810 810

Outdoor coil

Number of rows 1 2 Tube pitch(a)* row pitch(b) mm 21x13.37 25.4x22 Fin spacing mm 1.2 1.4 Fin type Hydrophilic aluminium Hydrophilic aluminium Tube outside dia.and type mm Φ7,innergroove tube Φ9.52,innergroove tube Coil length * height * width mm 870x504x13.37 860x508x44 Number of circuits 2 4

Outdoor air flow m3/h 2100 2100 Outdoor sound pressure level dB(A) 54 56.5 Throttle type Capillary+EXV Capillary+EXV

Outdoor unit Dimension(WxDxH) mm 800x333x554 800x333x554 Packing(WxDxH) mm 920x390x615 920x390x615 Net/Gross weight kg 30.5/33.5 36/39

Refrigerant Type R410A R410A GWP 2088 2088 Charged quantity Kg 1.25 1.7

Design pressure MPa 4.2/1.5 4.2/1.5

Refrigerant piping

Liquid side/ Gas side mm(inch) 2 x Φ6.35/Φ9.52(1/4"/3/8") 2 x Φ6.35/Φ9.52(1/4"/3/8") Max. length for all rooms m 30 30 Max. length for one indoor unit m 20 20

Max. height difference between indoor and outdoor unit

OU higher than IU

m 10 10

OU lower than IU

m 15 15

Max. height difference between indoor units

m 10 10

Ambient temperature

Cooling -15-50 -15-50 Heating -15-24 -15-24

1.The above design and specifications are subject to change without prior notice for product improvement.

2.The values given in the table for the noise level reflect the levels in hemi-anechoic rooms.



Outdoor Model M3OE-21HFN1-Q M3OE-27HFN1-Q

Indoor unit combination Single Double Three Single Double Three Power supply V-ph-Hz 220-240V- 50Hz, 1Ph 220-240V- 50Hz, 1Ph

Cooling

Capacity Btu/h 7000-12000 14000-18000 21000 7000-18000 14000-26000 27000 Input W 1000-1300 1500-1780 1917 750-1700 1400-2350 2465 Rated current A 4.4-5.7 6.5-7.7 8,3 3.3-7.4 6.1-10.2 10,7 EER W/W / / 3,21 / / 3,21

Heating

Capacity Btu/h 8000-14000 17000-20000 22500 8000-20000 16000-28000 28000 Input W 800-1200 1400-1630 1826 720-1750 1520-2174 2273 Rated current A 3.5-5.3 6.1-7.1 7,9 3.2-7.7 6.6-9.5 9,8 COP W/W / / 3,61 / / 3,61

Max. input consumption W 2800 3300 Max. input current A 15 16

Compressor

Model ASM135D23UFZ ATF235D22UMT Type ROTARY ROTARY Brand GMCC GMCC Capacity Btu/h 13836 24345 Input W 1035 1970 Rated current(RLA) A 7,32 6,95 Locked rotor Amp(LRA) A ----- ----- Thermal protector position ----- EXTERNAL Capacitor μF ----- ----- Refrigerant oil ml ESTER OIL VG74/450 POE(VG74)/670

Outdoor fan motor

New Model ZKFN-50-8-2 ZKFN-50-8-2 Model Qty 1 1 Output W 50 50 Capacitor μF - - - - Speed(Hi/Med/Lo) r/min 750 750

Outdoor coil

Number of rows 2 2 Tube pitch(a)* row pitch(b) mm 21x13.37 25.4x22 Fin spacing mm 1.2 1.4 Fin type Hydrophilic aluminium Hydrophilic aluminium Tube outside dia.and type mm Φ7, innergroove tube Φ9.52,innergroove tube Coil length * height * width mm 730x651x26.74 730x660x44 Number of circuits 6 4

Outdoor air flow m3/h 2700 3500 Outdoor sound pressure level dB(A) 57,5 59.5 Throttle type Capillary+EXV Capillary+EXV

Outdoor unit Dimension(WxDxH) mm 845x363x702 845x363x702 Packing(WxDxH) mm 965x395x755 965x395x755 Net/Gross weight kg 47/50.2 52.7/56.1

Refrigerant Type R410A R410A GWP 2088 2088 Charged quantity Kg 2,1 2,1

Design pressure MPa 4.2/1.5 4.2/1.5

Refrigerant piping

Liquid side/ Gas side mm(inch) 3 x Φ6.35/Φ9.52(1/4"/3/8") 3 x Φ6.35/Φ9.52(1/4"/3/8") Max. length for all rooms m 45 45 Max. length for one indoor unit m 25 25


OU higher than IU

m 10 10

OU lower than IU

m 15 15


m 10 10

Ambient temperature

Cooling -15-50 -15-50

Heating -15-24 -15-24





Outdoor Model M4OE-28HFN1-Q

Indoor unit combination Single Double Three Four Power supply V-ph-Hz 220-240V- 50Hz, 1Ph

Cooling

Capacity Btu/h 5000-15000 12000-21000 18000-24000 28000 Input W 1334-1784 1730-2403 2234-2777 2556 Rated current A 5.8-7.8 7.5-10.7 9.7-12.1 11,1 EER W/W / / / 3,21

Heating

Capacity Btu/h 5000-15000 12000-21000 18000-27000 30000 Input W 1656-2520 2131-3419 2959-3515 2435 Rated current A 7.2-11.0 9.3-14.9 12.9-15.3 10,6 COP W/W / / / 3,61

Max. input consumption W 3500 Max. input current A 17

Compressor

Model ATF235D22UMT Type ROTARY Brand GMCC Capacity Btu/h 24345 Input W 1970 Rated current(RLA) A 6,95 Locked rotor Amp(LRA) A ----- Thermal protector position EXTERNAL Capacitor μF ----- Refrigerant oil ml POE(VG74)/670

Outdoor fan motor

New Model ZKFN-120-8-2 Model WZDK120-38G-W Qty 1 Output W 120(Output) Capacitor μF ----- Speed(Hi/Med/Lo) r/min 800

Outdoor coil

Number of rows 1,6 Tube pitch(a)* row pitch(b) mm 25.4x22 Fin spacing mm 1,3 Fin type Hydrophilic aluminium Tube outside dia.and type mm Φ9.52,innergroove tube Coil length * height * width mm 1005x762x22+580x762x22 Number of circuits 4

Outdoor air flow m3/h 3800 Outdoor sound pressure level dB(A) 61 Throttle type Capillary+EXV

Outdoor unit Dimension(WxDxH) mm 946x410x810 Packing(WxDxH) mm 1090x500x865 Net/Gross weight kg 67.6/73.4

Refrigerant Type R410A GWP 2088 Charged quantity Kg 2,4

Design pressure MPa 4.2/1.5

Refrigerant piping

Liquid side/ Gas side mm(inch) 4 x Φ6.35/3x Φ9.52+1xΦ12.7(4x1/4"/3x3/8"+1x1/2") Max. length for all rooms m 60 Max. length for one indoor unit m 30


OU higher than IU

m 10

OU lower than IU

m 15

Max. height difference between indoor units m 10

Ambient temperature

Cooling -15-50

Heating -15-24





Outdoor Model M4OB-36HFN1-Q

Indoor unit combination Single Double Three Four Power supply V-ph-Hz 220-240V- 50Hz, 1Ph

Cooling

Capacity Btu/h 7000-18000 14000-26000 21000-36000 36000 Input W 1250-1700 1650-2320 2150-3520 3505 Rated current A 5.4-7.4 7.2-10.1 9.3-15.3 15,2 EER W/W / / / 3,01

Heating

Capacity Btu/h 7000-20000 16000-29000 24000-38000 38000 Input W 1375-2440 2050-3340 2880-3360 3266 Rated current A 5.9-10.6 8.9-14.5 12.5-14.6 14,2 COP W/W / / / 3,41

Max. input consumption W 4600 Max. input current A 21.5

Compressor

Model ATF310D43UMT Type ROTARY Brand GMCC Capacity Btu/h 32380 Input W 2600 Rated current(RLA) A 5,1 Locked rotor Amp(LRA) A ----- Thermal protector position INTERNAL Capacitor μF ----- Refrigerant oil ml PQE(VG74)/1000

Outdoor fan motor


Outdoor coil

Number of rows 2 Tube pitch(a)* row pitch(b) mm 25.4x22 Fin spacing mm 1.3 Fin type Hydrophilic aluminium Tube outside dia.and type mm Ф9.52, innergroove tube Coil length * height * width mm 995x762x44 Number of circuits 4

Outdoor air flow m3/h 5500 Outdoor sound pressure level dB(A) 63.5 Throttle type Capillary+EXV

Outdoor unit Dimension(WxDxH) mm 946x410x810 Packing(WxDxH) mm 1090x500x865 Net/Gross weight kg 70/75

Refrigerant Type R410A GWP 2088 Charged quantity Kg 3


Refrigerant piping



OU higher than IU

m 10

OU lower than IU

m 15

Max. height difference between indoor units m 10

Ambient temperature

Cooling -15-50

Heating -15-24





Outdoor Model M5OE-42HFN1-Q

Indoor unit combination Single Double Three FOUR Five Power supply V-ph-Hz 220-240V- 50Hz, 1Ph

Cooling

Capacity Btu/h 7000-18000 14000-28000 21000-36000 28000-40000 42000 Input W 680-1800 1400-2780 2100-3450 2700-3700 3822 Rated current A 3.0-8.0 6.2-11.8 9.0-15.0 11.6-16.0 16,6 EER W/W / / / / 3,22

Heating

Capacity Btu/h 7000-18000 14000-28000 21000-36000 28000-40000 42000 Input W 680-1800 1400-2680 1995-3330 2580-3570 3372 Rated current A 3.0-8.0 6.2-11.3 8.5-14.5 11.1-15.8 14,7 COP W/W / / / / 3,65

Max. input consumption W 4700 Max. input current A 22

Compressor

Model ATF310D43UMT Type ROTARY Brand GMCC Capacity Btu/h 32380 Input W 2600 Rated current(RLA) A 5,1 Locked rotor Amp(LRA) A ----- Thermal protector position INTERNAL Capacitor μF ----- Refrigerant oil ml PQE(VG74)/1000

Outdoor fan motor


Outdoor coil

Number of rows 2,6 Tube pitch(a)* row pitch(b) mm 25.4x22 Fin spacing mm 1.3 Fin type Hydrophilic aluminium Tube outside dia.and type mm Φ9.52,innergroove tube Coil length * height * width mm 978x762x44+580x762x22 Number of circuits 4

Outdoor air flow m3/h 5500 Outdoor sound pressure level dB(A) 62 Throttle type Capillary+EXV

Outdoor unit Dimension(WxDxH) mm 946x410x810 Packing(WxDxH) mm 1090x500x865 Net/Gross weight kg 76/81

Refrigerant Type R410A GWP 2088 Charged quantity Kg 3.6


Refrigerant piping



OU higher than IU

m 10

OU lower than IU

m 15


m 10

Ambient temperature

Cooling -15-50

Heating -15-24





4. Dimensions

A

BD

Model Unit：mm

W D H W1 A B

M2OE-14HFN1-Q 800 333 554 860 514 340

M2OF-18HFN1-Q 800 333 554 860 514 340

M3OE-21HFN1-Q 845 363 702 923 540 350

M3OE-27HFN1-Q 845 363 702 923 540 350

M4OE-28HFN1-Q 946 410 810 1034 673 403

M4OB-36HFN1-Q 946 410 810 1034 673 403

M5OE-42HFN1-Q 946 410 810 1034 673 403



5. Refrigeration Cycle Diagram 5.1 Refrigeration circuit drawing of inverter 1 drive 2 type

LIQUID VALVE A

GAS VALVE A

HEATEXCHANGE(EVAPORATOR)

HEATEXCHANGE(CONDENSER)

Compressor

4-WAY VALVE

COOLING

HEATING

T2 Evaporatortemp. sensormiddle

T1 Roomtemp. sensor

T3Condensertemp. sensor

T5 Dischargetemp. sensor

T4 Ambienttemp. sensor

INDOOR OUTDOOR

EXV A CAPILIARY A

CHECK VALVE

CAPILIARY TUBE

EXV B CAPILIARY BLIQUID VALVE B

GAS VALVE B

Accumulator

T2B-A Evaporatortemp. sensor outlet

T2B-B

5.2 Refrigeration circuit drawing of inverter 1 drive 3 type

LIQUID VALVE A

GAS VALVE A



Compressor

4-WAY VALVE

COOLING

HEATING


T1 Roomtemp. sensor




INDOOR OUTDOOR

EXV A CAPILIARY A

CHECK VALVE

CAPILIARY TUBE


GAS VALVE B

EXV C CAPILIARY CLIQUID VALVE C

GAS VALVE CAccumulator


T2B-B

T2B-C




LIQUID VALVE A

GAS VALVE A



Compressor

4-WAY VALVE

COOLING

HEATING


T1 Roomtemp. sensor




INDOOR OUTDOOR

EXV A CAPILIARY A

CHECK VALVE

CAPILIARY TUBE


GAS VALVE B


GAS VALVE C

EXV D CAPILIARY DLIQUID VALVE D

GAS VALVE D

Accumulator

High pressureswitch

Low pressureswitch


T2B-B

T2B-C

T2B-D


LIQUID VALVE A

GAS VALVE A



COOLING

HEATING


T1 Roomtemp. sensor



INDOOR OUTDOOR

EXV A CAPILIARY A

CHECK VALVE

CAPILIARY TUBE


GAS VALVE B


GAS VALVE C

EXV D CAPILIARY DLIQUID VALVE D

GAS VALVE D

EXV E CAPILIARY ELIQUID VALVE E

GAS VALVE ECompressor

4-WAY VALVE


Accumulator

High pressureswitch

Low pressureswitch


T2B-B

T2B-C

T2B-D

T2B-E



6. Wiring diagram M2OE-14HFN1-Q, M2OF-18HFN1-Q

M3OE-21HFN1-Q, M3OE-27HFN1-Q



M4OE-28HFN1-Q

M4OB-36HFN1-Q



M5OE-42HFN1-Q



7. Indoor units combination 7.1 Indoor unit combination for M2OE-14HFN1-Q

One unit Two unit

7 7+7 9+9

9 7+9 9+12

12 7+12

18

7.2 Indoor unit combination for M2OF-18HFN1-Q

One unit Two unit

7 7+7 9+9

9 7+9 9+12

12 7+12 9+18

18 7+18 12+12

7.3 Indoor unit combination for M3OE-21HFN1-Q

One unit Two unit Three unit

7 7+7 9+9 7+7+7 7+9+12

9 7+9 9+12 7+7+9 9+9+9

12 7+12 9+18 7+7+12 9+9+12

18 7+18 12+12 7+9+9 7+12+12


One unit Two unit Three unit

7 7+7 9+9 12+18 7+7+7 7+9+9 7+12+18 9+12+12

9 7+9 9+12 18+18 7+7+9 7+9+12 9+9+9 9+12+18

12 7+12 9+18 7+7+12 7+9+18 9+9+12 12+12+12

18 7+18 12+12 7+7+18 7+12+12 9+9+18


One unit Two unit Three unit Four unit

7 7+7 9+9 12+18 7+7+7 7+9+9 7+12+18 9+12+18 7+7+7+7 7+7+9+9 7+9+9+12

9 7+9 9+12 12+24 7+7+9 7+9+12 9+9+9 12+12+12 7+7+7+9 7+7+9+12 7+9+12+12

12 7+12 9+18 18+18 7+7+12 7+9+18 9+9+12 12+12+18 7+7+7+12 7+7+9+18 9+9+9+9

18 7+18 12+12 7+7+18 7+9+24 9+9+18 7+7+7+18 7+7+12+12 9+9+9+12

24 7+24 9+24 7+7+24 7+12+12 9+12+12 7+9+9+9



7.6 Indoor unit combination for M4OB-36HFN1-Q


One Unit Two Unit Three Unit

7 7+7 9+18 7+7+7 7+9+18 9+9+12 12+12+12

9 7+9 9+24 7+7+9 7+9+24 9+9+18 12+12+18

12 7+12 12+12 7+7+12 7+12+12 9+9+24 12+12+24

18 7+18 12+18 7+7+18 7+12+18 9+12+12 12+18+18

24 7+24 12+24 7+7+24 7+12+24 9+12+18

9+9 18+18 7+9+9 7+18+18 9+12+24

9+12 7+9+12 9+9+9 9+18+18

Four Unit

7+7+7+7 7+7+9+18 7+9+9+12 7+12+12+12 9+9+12+12

7+7+7+9 7+7+9+24 7+9+9+18 7+12+12+18 9+9+12+18

7+7+7+12 7+7+12+12 7+9+9+24 7+12+12+24 9+9+12+24

7+7+7+18 7+7+12+18 7+9+12+12 9+9+9+9 9+12+12+12

7+7+7+24 7+7+12+24 7+9+12+18 9+9+9+12 9+12+12+18

7+7+9+9 7+7+18+18 7+9+12+24 9+9+9+18 12+12+12+12

7+7+9+12 7+9+9+9 7+9+18+18 9+9+9+24 12+12+12+18

Five Unit

7+7+7+7+7 7+7+7+9+18 7+7+9+9+24 7+9+9+12+12 9+9+9+12+12

7+7+7+7+9 7+7+7+9+24 7+7+9+12+18 7+9+9+12+18 9+9+9+12+18

7+7+7+7+12 7+7+7+12+18 7+7+12+12+12 7+9+12+12+12 9+9+12+12+12

7+7+7+7+18 7+7+7+18+18 7+7+12+12+18 7+9+12+12+18 9+12+12+12+12

7+7+7+7+24 7+7+9+9+9 7+9+9+9+9 9+9+9+9+9 9+12+12+12+18

7+7+7+9+9 7+7+9+9+12 7+9+9+9+12 9+9+9+9+12 12+12+12+12+12

7+7+7+9+12 7+7+9+9+18 7+9+9+9+18 9+9+9+9+18

One unit Two unit Three unit Four unit

7 7+7 9+18 7+7+7 7+9+18 9+9+12 12+12+12 7+7+7+7 7+7+9+24 7+9+12+12 9+9+12+12

9 7+9 9+24 7+7+9 7+9+24 9+9+18 12+12+18 7+7+7+9 7+7+12+12 7+9+12+18 9+9+12+18

12 7+12 12+12 7+7+12 7+12+12 9+9+24 12+12+24 7+7+7+12 7+7+12+18 7+9+18+18 9+12+12+12

18 7+18 12+18 7+7+18 7+12+18 9+12+12 12+18+18 7+7+7+18 7+7+18+18 7+12+12+12 9+12+12+18

24 7+24 12+24 7+7+24 7+12+24 9+12+18 7+7+7+24 7+9+9+9 7+12+12+18 12+12+12+12

9+9 18+18 7+9+9 7+18+18 9+12+24 7+7+9+9 7+9+9+12 9+9+9+9 12+12+12+18

9+12 7+9+12 9+9+9 9+18+18 7+7+9+12 7+9+9+18 9+9+9+12

7+7+9+18 7+9+9+24 9+9+9+18



8. Sound Levels

H

1.0m

Outdoor Unit

Microphone

Note: H= 0.5 × height of outdoor unit

Model Noise Power dB(A) Noise level dB(A)

M2OE-14HFN1-Q

M2OF-18HFN1-Q 65 56.5

M3OE-21HFN1-Q 65 57.5

M3OE-27HFN1-Q 68 59.5

M4OE-28HFN1-Q 66 60

M4OB-36HFN1-Q 68 63.5

M5OE-42HFN1-Q 68 62



9. Installation Details 9.1 Wrench torque sheet for installation

Outside diameter Torque Additional tightening torque

mm N.cm N.cm

Ф6.35 1500(153kgf.cm) 1600(163kgf.cm)

Ф9.52 2500(255kgf.cm) 2600(265kgf.cm)

Ф12.7 3500(357kgf.cm) 3600(367kgf.cm)

9.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet.

Rated current of appliance Nominal cross-sectional area (mm²)

>3 and ≤6 0.75

>6 and ≤10 1

>10 and ≤16 1.5

>16 and ≤25 2.5

The cable size and the current of the fuse or switch are determined by the maximum current indicated on the

nameplate which located on the side panel of the unit. Please refer to the nameplate before selecting the

cable, fuse and switch.

9.3 Pipe length and the elevation

Maximum piping length and height difference

1 drive 2 1 drive 3 1 drive 4 1 drive 5

Max. length for all rooms (m) 30 45 60 75

Max. length for one IU (m) 20 25 30 30

Max. height difference between IU and OU (m)

OU higher than IU 10 10 10 10

OU lower than IU 15 15 15 15

Max. height difference between IUs (m) 10 10 10 10

Additional refrigerant charge

1 drive 2 1 drive 3 1 drive 4 1 drive 5

Chargeless pipe length (m)

10 15 20 25

Additional refrigerant charge

(g)

15 x (length for all rooms - 10)




Caution:

Refrigerant pipe diameter is different according to indoor unit to be connected. When using the

extension pipe, refer to the tables below.



When refrigerant pipe diameter is different from that of outdoor unit union (for 18K indoor unit), additional

transfer connector needs to be used on outdoor unit union.

Indoor unit Extension pipe diameter (mm/inch)

Model Pipe diameter (mm/inch)

7K9K12K Liquid 6.35(1/4) Liquid 6.35(1/4) Gas 9.52(3/8) Gas 9.52(3/8)

18K Liquid 6.35(1/4) Liquid 6.35(1/4) Gas 12.7(1/2) Gas 12.7(1/2)

24K Liquid 9.52(3/8) Liquid 9.52(3/8) Gas 15.9(5/8) Gas 15.9(5/8)

Outdoor unit union diameter (mm/inch)

Indoor unit A/B/C/D/E Liquid 6.35(1/4)

Gas 9.52(3/8) 12.7(1/2)

9.4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below:

Pressure in the system rises. Operating current rises. Cooling or heating efficiency drops. Moisture in the refrigerant circuit may freeze and block capillary tubing. Water may lead to corrosion of parts in the refrigerant system.

Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and evacuated to remove gas and moisture from the system.

Gas leak check (Soap water method):

Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles come out, the pipes have leakage.



1. Air purging with vacuum pump

1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and 3-way

valves are set to the closed position. 2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.. 3) Connect the charge hose of handle hi connection to the vacuum pump. 4) Fully open the handle Lo of the manifold valve. 5) Operate the vacuum pump to evacuate. 6) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If

the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If the pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points.

Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

7) Turn the flare nut of the 3-way valves about 45° counterclockwise for 6 or 7seconds after the gas

coming out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a little higher than the atmosphere pressure. Then remove the charge hose from the 3 way valve.

8) Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve.

(Indoor unit) (Liquid side)

(Gas side)

Vacuum pump

Vacuum pump

Lo Hi

Handle Hi

Two-way valve

Close

Manifold valveCompound meter

Pressure gauge

-0.1MPa

Handle Lo

Charge hose Charge hose

(Outdoor unit)

Close

Three-way valve



2. Air purging by refrigerant

Procedure:

1). Confirm that both the 2-way and 3-way valves are set to the closed position.

2). Connect the charge set and a charging cylinder to the service port of the 3-way valve.

3). Air purging.

Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the

2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.

After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.

4). Check the gas leakage.

Check the flare connections for gas leakage.

5). Discharge the refrigerant.

Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the

2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa.

6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open

position.

Be sure to use a hexagonal wrench to operate the valve stems.

7). Mount the valve stems nuts and the service port cap.

Be sure to use a torque wrench to tighten the service port cap to a torque 18N∙m.

Be sure to check the gas leakage.



3. Adding the refrigerant if the pipe length >5m

Procedure:

1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve.

Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the

cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure the liquid charge.

2). Purge the air from the charge hose.

Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be

careful of the liquid refrigerant).

3) Put the charging cylinder onto the electronic scale and record the weight.

4) Operate the air conditioner at the cooling mode.

5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.

6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose from

the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose.

7). Mount the valve stem caps and the service port

Use torque wrench to tighten the service port cap to a torque of 18N.m.

Be sure to check for gas leakage.

Electronic scale



9.5 Adding the refrigerant after running the system for many years

Procedure:

1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve.

Connect the charge hose to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the

cylinder bottom up to ensure liquid charge.

2). Purge the air from the charge hose.




4) Operate the air conditioner at the cooling mode.

5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.

6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low side),

disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner

before disconnecting the hose.

7). Mount the valve stem caps and the service port



Electronic scale



9.6 Re-installation while the indoor unit need to be repaired 1. Collecting the refrigerant into the outdoor unit

Procedure

1). Confirm that both the 2-way and 3-way valves are set to the opened position

Remove the valve stem caps and confirm that the valve stems are in the opened position.


2). Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.

3). Air purging of the charge hose.

Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and

then close it quickly.

4). Set the 2-way valve to the close position.

5). Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.

6). Set the 3-way valve to the closed position immediately

Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.

Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts.

Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 kgf.m.




2. Air purging by the refrigerant

Procedure:

1). Confirm that both the 2-way and 3-way valves are set to the closed position.

2). Connect the charge set and a charging cylinder to the service port of the 3-way valve

Leave the valve on the charging cylinder closed.

3). Air purging.

Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the

2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.

After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.

4). Check the gas leakage

Check the flare connections for gas leakage.

5). Discharge the refrigerant.

Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the

2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa.

6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open

position


7). Mount the valve stems nuts and the service port cap

Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.

Be sure to check the gas leakage.



9.7 Re-installation while the outdoor unit need to be repaired 1. Evacuation for the whole system

Procedure:

1). Confirm that both the 2-way and 3-way valves are set to the opened position.

2). Connect the vacuum pump to 3-way valve’s service port.

3). Evacuation for approximately one hour. Confirm that the compound meter indicates -0.1Mpa.

4). Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge

needle does not move (approximately 5 minutes after turning off the vacuum pump).

5). Disconnect the charge hose from the vacuum pump.



2. Refrigerant charging

Procedure:

1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve

Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the

cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge.

2). Purge the air from the charge hose




4). Open the valves (Low side) on the charge set and charge the system with liquid refrigerant

If the system cannot be charge with the specified amount of refrigerant, or can be charged with a little at a

time (approximately 150g each time) , operating the air conditioner in the cooling cycle; however, one time is

not sufficient, wait approximately 1 minute and then repeat the procedure.

5).When the electronic scale displays the proper weight, disconnect the charge hose from the 3-way valve’s

service port immediately

If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air

conditioner before disconnecting the hose.

6). Mounted the valve stem caps and the service port


Be sure to check for gas leakage



10. Electronic control function 10.1 Abbreviation T1: Indoor ambient temperature

T2: Coil temperature of indoor heat exchanger middle.

T2B: Coil temperature of indoor heat exchanger outlet(This sensor is located in outdoor unit)

T3: Coil temperature of outdoor heat exchanger

T4: Outdoor ambient temperature

T5: Compressor discharge temperature

Ts: Setting temperature

10.2 Electric control working environment. 8.2.1 Input voltage: 198V~264V.

8.2.2 Input power frequency:50Hz.

8.2.3 Indoor fan normal working amp. is less than 1A.

8.2.4 Outdoor fan. normal working amp. is less than 1.5A.

8.2.5 Four-way valve normal working amp. is less than 1A.

10.3 Outdoor unit’s digital display tube There is a digital display tube in outdoor PCB.

Digital display tube display function

In standby , the LED displays “- -” In compressor operation, the LED display the running frequency, In defrosting mode, The LED displays “dF” or alternative displays between running frequency and

“dF”(each displays 0.5s) In compressor pre-heating, The LED displays “PH” or alternative displays between running frequency

and “PH”(each displays 0.5s) During the oil return process, The LED displays “RO” or alternative displays between running

frequency and “RO”(each displays 0.5s) In low ambient cooling mode, the LED displays “LC” or alternative displays between running

frequency and “LC”(each displays 0.5s) In forced cooling mode, the LED displays “FC” or alternative displays between running frequency and

“FC”(each displays 0.5s) When PFC module protection occurs three times within 15 minutes, the LED displays “E6” or

alternative displays between running frequency and “E6”(each displays 0.5s) In protection or malfunction, the LED displays error code or protection code.

10.4 Outdoor unit point check function There is a check switch in outdoor PCB. Press the switch N times it will display the content corresponding to No. N. After getting into the check function, it will display No. N with 1.5s, meanwhile the low bit decimal of digit display flashing, indicated to get into the check function display. After 1.5s, it will display the content corresponding to No. N.

the digital display tube will display the follow procedure when push SW1 each time.

Display Remark

0 Normal display Display running frequency, running state or malfunction code

1 No. of indoor units in good connection Actual data

2 Outdoor unit running mode code Standby:0,Fan only 1, Cooling:2, Heating:3, Forced cooling:4 Forced defrosting:5



3 A indoor unit capacity

The capacity unit is horse power. If the indoor unit is not connected, the digital display tube will show: “――”

(7K:0.8HP, 9K:1HP,12K:1.2HP,18K:1.5HP)

4 B indoor unit capacity

5 C indoor unit capacity

6 D indoor unit capacity

7 E indoor unit capacity

8 A Indoor unit capacity demand code

Norm value*HP

(7K:0.8HP, 9K:1HP,12K:1.2HP,18K:1.5HP)

9 B Indoor unit capacity demand code

10 C Indoor unit capacity demand code

11 D Indoor unit capacity demand code

12 E Indoor unit capacity demand code

13 Total indoor units amendatory capacity demand code

14 The frequency corresponding to the total indoor units amendatory capacity demand

15 The frequency after the frequency limit

16 The frequency sending to compressor control chip

17 A indoor unit evaporator outlet temp.(T2BA)

If the temp. is lower than -9 degree, the digital display tube will show “-9”.If the temp. is higher than 70 degree, the digital display tube will show “70”. If the indoor unit is not connected, the digital display tube will show: “――”

18 B indoor unit evaporator outlet temp.(T2BB)

19 C indoor unit evaporator outlet temp.(T2BC)

20 D indoor unit evaporator outlet temp.(T2BD)

21 E indoor unit evaporator outlet temp.(T2BE)

22 A indoor unit room temp.(T1A) If the temp. is lower than 0 degree, the digital display tube will show “0”.If the temp. is higher than 70 degree, the digital display tube will show “70”. If the indoor unit is not connected, the digital display tube will show: “――”

23 B indoor unit room temp.(T1B)

24 C indoor unit room temp.(T1C)

25 D indoor unit room temp.(T1D)

26 E indoor unit room temp.(T1E)

27 A indoor unit evaporator temp.(T2A)

If the temp. is lower than -9 degree, the digital display tube will show “-9”.If the temp. is higher than 70 degree, the digital display tube will show “70”. If the indoor unit is not connected, the digital display tube will show: “――”

28 B indoor unit evaporator temp.(T2B)

29 C indoor unit evaporator temp.(T2C)

30 D indoor unit evaporator temp.(T2D)

31 E indoor unit evaporator temp.(T2E)

32 Condenser pipe temp.(T3)

33 Outdoor ambient temp.(T4)

34 Compressor discharge temp.(T5) The display value is between 30~129 degree. If the temp. is lower than 30 degree, the digital display tube will show “30”.If the temp. is higher than 99 degree, the digital display tube will show single digit and tens digit. For example, the digital display tube show “0.5”,it means the compressor discharge temp. is 105 degree.)

35 AD value of current The display value is hex number.

For example ,the digital display tube show “Cd”, it means AD value is 205.

36 AD value of voltage

37 EXV open angle for A indoor unit Actual data/4.

If the value is higher than 99, the digital display tube will show single digit and tens digit.

For example ,the digital display tube show “2.0”,it means the EXV open angle is 120×4=480p.)

38 EXV open angle for B indoor unit

39 EXV open angle for C indoor unit

40 EXV open angle for D indoor unit

41 EXV open angle for E indoor unit

42 Frequency limit symbol

Bit7 Frequency limit caused by IGBT radiator

The display value is hex number. For example, the digital display tube show 2A,then

Bit6 Frequency limit caused by PFC

Bit5 Frequency limit caused by T4.



Bit4 Frequency limit caused by T2. Bit5=1, Bit3=1, Bit1=1.

It means frequency limit caused by T4,T3 and current.



Bit1 Frequency limit caused by current

Bit0 Frequency limit caused by voltage

43 Average value of T2 (Sum T2 value of all indoor units)/( number of indoor units in good connection)(cooling:T2B, heating:T2)

44 Outdoor unit fan motor state Fan off:0, High speed:1, Med speed:2, Low speed:3 Breeze:4, Super breeze:5

45 The last error or protection code 00 means no malfunction and protection

10.5 Protection 10.5.1 Three minutes delay at restart for compressor.

10.5.2 Temperature protection of compressor discharge.

When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules:

T5

C om pressor o ff

F requency lim it

N orm al

F requ ency ho ld ing

10.5.3 Low voltage protection

VO LTAGE

N o lim it

VOLT_LTM _FR EQ 1_AD D

VOLT_LTM _FR EQ 2_AD D

Note: if the low voltage protection occurs and not resumes within 3min, it will keep the protection always after restart the machine.

10.5.4 Compressor current limit protection

Temperature interval.of current limit is same as range of T4 limited frequency.



Cooling mode:

T4

CoolZone5

CoolZone4

CoolZone3

CoolZone2

CoolZone1

Heating mode:

T4

HeatZone4

HeatZone3

HeatZone2

HeatZone1

10.5.5 Indoor / outdoor units communication protection

If the indoor units cannot receive the feedback signal from the outdoor units for 2 minutes, the AC will stop and display the failure.

10.5.6 High condenser coil temp. protection.

T3

Resume

Off

Decrease

Hold

10.5.7 Outdoor unit anti-freezing protection

When T2<4 for 250 seconds or T2<0, the indoor unit capacity demand will be zero and resume to normal when T2>8 and the time of protection is no less than 3 minutes.

10.5.8 Oil return

Running rules:

1. If the compressor frequency keeps lower than setting frequency for setting time, the AC will rise the frequency to setting frequency for setting time and then resume to former frequency.

2. The EXV will keep 300p while the indoor units will keep the current running mode.

If the outdoor ambient is higher than setting frequency during the oil return, the AC quit oil return.



10.5.9 Low outdoor ambient temperature protection

When compressor is off, T4 is be lower than -35.for 10s, the AC will stop and display “LP”.

When compressor is on, T4 is be lower than -40.for 10s, the AC will stop and display “LP”.

When T4 is no lower than -32.for 10s, the unit will exit protection.



11. Troubleshooting 11.1 Indoor unit error code explanation:

For MTBI-18HWDN1-Q

MALFUNCTION RUN Timer DEF Alarm DISPLAY DIGITAL

TUBE

Open or short circuit of T1 temperature sensor X X X E0

Open or short circuit of T2 temperature sensor X X X E1

Indoor / outdoor units communication error X X X E2

Full-water malfunction X X X E3

Indoor EEPROM malfunction X X E4

IPM module protection X X O E5

Open or short circuit of T3 or T4 temperature sensor or Outdoor EEPROM malfunction

O X X E6

Outdoor fan speed has been out of control O X E7

Indoor fan speed has been out of control O O X F5

Voltage protection O X O P0

Outdoor unit over-current protection X P2

Inverter compressor drive protection X X P4

Mode conflict X O O P5

O (on) X(off) (flash at 2Hz) (flash at 0.5Hz)

For other type

Malfunction Error Code Timer Lamp Operation Lamp

(flashes)

Indoor EEPROM malfunction E0 X 1

Communication malfunction between indoor and outdoor units E1 X 2

Indoor fan speed has been out of control E3 X 4

Open or short circuit of T1 temperature sensor E4 X 5

Open or short circuit of T2 temperature sensor E5 X 6

Water level alarm EE X 8

Overcurrent protection (For some units) F0 O 1

Open or short circuit of T4 temperature sensor F1 O 2



Outdoor EEPROM malfunction (For some units) F4 O 5

Outdoor fan speed is out of control F5 O 6

Open or short circuit of T2B temperature sensor (For free-match indoor units)

F6 O 7

Communication error between auto-lifting panel and slim cassette (For slim cassette with auto-lifting panel)

F7 O 8

Auto-lifting panel is faulty (For slim cassette with auto-lifting panel) F8 O 9

Auto-lifting panel is not closed (For slim cassette with auto-lifting panel) F9 O 10

IPM module malfunction P0 1



Over voltage or over low voltage protection P1 2

Too low ambient temperature protection P3 4

Error rotor position protection of compressor P4 5

Mode conflict P5 6

Low pressure protection of compressor P6 7

O (on) X(off) (flash at 2Hz)

11.2 Outdoor unit error code explanation:

Display LED STATUS

E0 Outdoor EEPROM malfunction

E2 Indoor / outdoor units communication error

E3 Communication malfunction between IPM board and outdoor main board

E4 Open or short circuit of outdoor unit temperature sensor

E5 Voltage protection

E8 Outdoor fan speed has been out of control

F1 No A Indoor unit coil outlet temperature sensor or connector of sensor is defective

F2 No B Indoor unit coil outlet temperature sensor or connector of sensor is defective

F3 No C Indoor unit coil outlet temperature sensor or connector of sensor is defective

F4 No D Indoor unit coil outlet temperature sensor or connector of sensor is defective

F5 No E Indoor unit coil outlet temperature sensor or connector of sensor is defective

P1 High pressure protection (ForM4OE-28HFN1-Q, M4OB-36HFN1-Q, M5OE-42HFN1-Q)

P2 Low pressure protection (ForM4OE-28HFN1-Q, M4OB-36HFN1-Q, M5OE-42HFN1-Q)

P3 Current protection of compressor

P4 Temperature protection of compressor discharge

P5 High temperature protection of condenser

P6 IPM module protection

LP Low ambient temperature protection

Note: Once these error codes display, they will disappear in at least 30 seconds if the unit come back to normal. (Except E2&E3)



11.3 Trouble shooting

11.3.1 For the indoor unit

11.3.1.1 Indoor EEPROM malfunction

EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and

reprogrammed using a pulsed voltage.



11.3.1.2 Indoor / outdoor units communication error



Pic 2: IPM or outdoor main PCB

Self-Check

Power,

Operating

Self-Check

Operating

Pic 2: IPM or outdoor main PCB

Pic 1: check the voltage of N to S (Vs), is it moving alternately between positive value and negative value?



.

PIC 3: Main board LED when power on and unit standby.

PIC 4: check point button,

Press 1 time for check how many indoor units are connected



11.3.1.3 indoor unit fan speed has been out of control

Index 1:

1: Indoor AC fan motor

Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply)or 50V(115V power supply), the PCB must have problems and need to be replaced.

2. Indoor DC fan motor(control chip is inside fan motor)

Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must have problems and need to be replaced.

For other models:



DC motor voltage input and output

For split type:

NO. Color Signal Voltage

1 Red Vs/Vm 280V~380V

2 --- --- ---

3 Black GND 0V

4 White Vcc 14-17.5V

5 Yellow Vsp 0~5.6V

6 Blue FG 14-17.5V

For other types:



2 --- --- ---

3 Black GND 0V

4 White Vcc 13.5-16.5V

5 Yellow Vsp 0~6.5V

6 Blue FG 13.5-16.5V



11.3.1.4 Open or short circuit of temperature sensor.

Check the connections between temperature sensor and PCB. Are the

connections good?

Correct the connections.No

Yes

No Replace the sensor.

Replace the indoor PCB

Measure the resistance value of the sensor via Appendix 1

Is it normal?

Yes

11.3.1.5 Full-water malfunction



11.3.2 For the outdoor unit

11.3.2.1 Outdoor EEPROM malfunction(ODU E0)

EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and

reprogrammed using a pulsed voltage.



11.3.2.2 Communication malfunction between IPM board and outdoor main board(ODU E3)



11.3.2.3 Voltage protection(ODU E5)

Voltage protection

Check the voltage of outdoor unit power supply,

whether the voltage between L(L1) and N (L2) is

about 220~240VAC

Check the power supply

Check whether the voltage of IPM board P and N is normal? DC277-356V for

18-27KBtu/h; DC277-410V for 36-42KBtu/h

Replace bridge rectifiers, and then check whether the

system can run normally

Replace IPM board, and then check whether the system can run normally

Replace outdoor main board

Yes

No

No

No

No

Yes

Trouble is solved

Yes

Yes



11.3.2.4 Outdoor unit fan speed has been out of control (E8)

Index 1:

1. Outdoor DC fan motor (control chip is inside fan motor)

Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must have problems and need to be replaced.

DC motor voltage input and output



2 --- --- ---

3 Black GND 0V

4 White Vcc 13.5-16.5V

5 Yellow Vsp 0~6.5V

6 Blue FG 15V



11.3.2.5 High pressure protection (ODU P1) (ForM4OE-28HFN1-Q, M4OB-36HFN1-Q, M5OE-42HFN1-Q)



11.3.2.6 Low pressure protection (ODU P2)(ForM4OE-28HFN1-Q, M4OB-36HFN1-Q, M5OE-42HFN1-Q)

Low pressure protection

Whether the wiring between the low pressure protector and main control board is connected well or

correctly

Method: Disconnect the plug. Measure the resistance of the low pressure protector. If the

protector is normal the value is o

Yes

Yes

Connect it well

Replace outdoor main board

No

Replace low pressure protectorNo

Whether the low pressure protector

is broken

Check whether the outdoor ambient temperature is too

low

No

Stop the unitYes

Open fully valve core of high pressure valve

No

Check whether valve core of high pressure valve is

opened

Check if the indoor fan runs properly in cooling mode

please refer to the solution of fan speed has been out of control

malfunction. Find out the cause and have it solved.

No

Yes

Yes

No

Check whether the refrigerant

system is ok

Refrigerant is not enough add the

refrigerant

No



11.3.2.7 Current protection of compressor (ODU P3)



11.3.2.8 Temperature protection of compressor discharge (ODU P4)

Temperature protection of compressor discharge

Check whether the compressor discharge temp. is

more than 115°C ?

Check whether the connection is right between compressor discharge temp. sensor and PCB according to wiring diagrams?

Measure the resistance value of compressor discharge

temp. sensor. If the value is not normal is normal refer to

the Appendix 2?

No

Yes

Yes

No Correct the wiring connection

Stop leaking and add refrigerant

Replace the compressor discharge temp. sensorNo

Yes

Replace high pressure valve assy

Yes

No

Replace outdoor main PCB

No

Check whether the refrigerant is leak



11.3.2.9 High temperature protection of condenser (ODU P5)

When outdoor pipe temperature is more than 65°C, the unit will stop, and unit runs again when outdoor pipe temperature less than 52°C.

High temperature protection of condenser

Check whether the condenser temperature is

Higher than 65°C

Yes

Check whether the resistance of condenser temp. sensor is normal refer to the Appendix 1

Replace the temperature sensor

No

No

Check whether the outdoor ambient temperature is

higher than 50

No

Stop the unitYes

Check if the outdoor unit

ventilation is good

Yes

Make the outdoor unit ventilate well

Check whether the heat exchanger is dirty

No

Clean the heat exchangerYes

Check whether the refrigerant system is ok

Replace outdoor main

board

No

Refrigerant is not enough add the

refrigerant

No

Check if the outdoor fan runs

properly

please refer to the solution of fan speed has been out of control

malfunction . Find out the cause and

have it solved.

No

Yes

No

Correct the connectionNo

Yes

Check the connection between temperature

sensor and PCB.

Yes



11.3.2.10 IPM module protection (ODU P6)

IPM module protection

Check whether the voltage range of P‐N on IPM module is normal? DC277‐356V for 18‐28KBtu/h; DC277‐410V for 36‐42KBtu/h

Yes

Yes

No

Yes

Check whether the input power supply is correct? 208‐230V, 1N, 60Hz

No NoRegulate it to correct, then check whether the system

can work normally?

Check whether the power supply line is

connected correctly and tightly

Yes

Connect it correctly and tightly, check ok

or not?No

Check whether the connecting line between main board and the IPM module is connected

tightly

Yes

Connect it tightly, check ok or not?

No

No

No

Connect it well, check ok or not?

Check whether the connecting line of the compressor is

connected correctly or tightly

Replace the IPM module, check whether the system can

work normally?

No

No

Replace the main board; check whether the system can work

normally?

No

Replace the compressor, check whether the system can work

normally?

Check whether the lines in E‐part box are connected tightly

Yes

Connect it tightly, check ok or not?

No

No

Yes No

Replace the bridge rectifiers

Check whether the bridge rectifiers are normal? Use the multimeter to measure

the resistance between each two terminals, check whether there is the condition that value of resistance is 0

Check whether the connecting line of every reactor is normal? If the line is broken, the resistance of the two ports is

∞（models except for M4OA‐36HFN1‐Q,M4OD‐28HFN1‐Q, M5OC‐36HFN1‐

Q）；Check whether the PFC module broken (for M4OA‐36HFN1‐Q,M4OD‐28HFN1‐Q, M5OC‐36HFN1‐Q,M50D‐

42HFN1‐Q)

Replace the connecting line or reactor or replace the PFC

module(for M4OC‐36HRFN1‐M,M50D‐42HFN1‐Q)

Yes

No

No

Yes

Trouble is solved

Check if the outdoor fan runs properly or the outdoor

unit ventilation is good.

No

Check whether the resistance of the fan motor is normal. If not, replace the fan motor. For other models, refer to the solution of fan speed has been out of control malfunction . F ind out the cause and have it solved.

Yes

Yes

Yes



11.4 Main parts check

1. Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester.

Temperature Sensors.

Room temp.(T1) sensor,

Indoor coil temp.(T2) sensor,

Outdoor coil temp.(T3) sensor,

Outdoor ambient temp.(T4) sensor,

Compressor discharge temp.(T5) sensor.

Measure the resistance value of each winding by using the multi-meter.



Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4,T2B (--K)

K Ohm K Ohm K Ohm K Ohm

-20 115.266 20 12.6431 60 2.35774 100 0.62973

-19 108.146 21 12.0561 61 2.27249 101 0.61148

-18 101.517 22 11.5000 62 2.19073 102 0.59386

-17 96.3423 23 10.9731 63 2.11241 103 0.57683

-16 89.5865 24 10.4736 64 2.03732 104 0.56038

-15 84.2190 25 10.000 65 1.96532 105 0.54448

-14 79.3110 26 9.55074 66 1.89627 106 0.52912

-13 74.5360 27 9.12445 67 1.83003 107 0.51426

-12 70.1698 28 8.71983 68 1.76647 108 0.49989

-11 66.0898 29 8.33566 69 1.70547 109 0.48600

-10 62.2756 30 7.97078 70 1.64691 110 0.47256

-9 58.7079 31 7.62411 71 1.59068 111 0.45957

-8 56.3694 32 7.29464 72 1.53668 112 0.44699

-7 52.2438 33 6.98142 73 1.48481 113 0.43482

-6 49.3161 34 6.68355 74 1.43498 114 0.42304

-5 46.5725 35 6.40021 75 1.38703 115 0.41164

-4 44.0000 36 6.13059 76 1.34105 116 0.40060

-3 41.5878 37 5.87359 77 1.29078 117 0.38991

-2 39.8239 38 5.62961 78 1.25423 118 0.37956

-1 37.1988 39 5.39689 79 1.21330 119 0.36954

0 35.2024 40 5.17519 80 1.17393 120 0.35982

1 33.3269 41 4.96392 81 1.13604 121 0.35042

2 31.5635 42 4.76253 82 1.09958 122 0.3413

3 29.9058 43 4.57050 83 1.06448 123 0.33246

4 28.3459 44 4.38736 84 1.03069 124 0.32390

5 26.8778 45 4.21263 85 0.99815 125 0.31559

6 25.4954 46 4.04589 86 0.96681 126 0.30754

7 24.1932 47 3.88673 87 0.93662 127 0.29974

8 22.5662 48 3.73476 88 0.90753 128 0.29216

9 21.8094 49 3.58962 89 0.87950 129 0.28482

10 20.7184 50 3.45097 90 0.85248 130 0.27770

11 19.6891 51 3.31847 91 0.82643 131 0.27078

12 18.7177 52 3.19183 92 0.80132 132 0.26408

13 17.8005 53 3.07075 93 0.77709 133 0.25757

14 16.9341 54 2.95896 94 0.75373 134 0.25125

15 16.1156 55 2.84421 95 0.73119 135 0.24512

16 15.3418 56 2.73823 96 0.70944 136 0.23916

17 14.6181 57 2.63682 97 0.68844 137 0.23338

18 13.9180 58 2.53973 98 0.66818 138 0.22776

19 13.2631 59 2.44677 99 0.64862 139 0.22231



Appendix 2 Temperature Sensor Resistance Value Table for T5 (--K)

K Ohm K Ohm K Ohm K Ohm

-20 542.7 20 68.66 60 13.59 100 3.702

-19 511.9 21 65.62 61 13.11 101 3.595

-18 483 22 62.73 62 12.65 102 3.492

-17 455.9 23 59.98 63 12.21 103 3.392

-16 430.5 24 57.37 64 11.79 104 3.296

-15 406.7 25 54.89 65 11.38 105 3.203

-14 384.3 26 52.53 66 10.99 106 3.113

-13 363.3 27 50.28 67 10.61 107 3.025

-12 343.6 28 48.14 68 10.25 108 2.941

-11 325.1 29 46.11 69 9.902 109 2.86

-10 307.7 30 44.17 70 9.569 110 2.781

-9 291.3 31 42.33 71 9.248 111 2.704

-8 275.9 32 40.57 72 8.94 112 2.63

-7 261.4 33 38.89 73 8.643 113 2.559

-6 247.8 34 37.3 74 8.358 114 2.489

-5 234.9 35 35.78 75 8.084 115 2.422

-4 222.8 36 34.32 76 7.82 116 2.357

-3 211.4 37 32.94 77 7.566 117 2.294

-2 200.7 38 31.62 78 7.321 118 2.233

-1 190.5 39 30.36 79 7.086 119 2.174

0 180.9 40 29.15 80 6.859 120 2.117

1 171.9 41 28 81 6.641 121 2.061

2 163.3 42 26.9 82 6.43 122 2.007

3 155.2 43 25.86 83 6.228 123 1.955

4 147.6 44 24.85 84 6.033 124 1.905

5 140.4 45 23.89 85 5.844 125 1.856

6 133.5 46 22.89 86 5.663 126 1.808

7 127.1 47 22.1 87 5.488 127 1.762

8 121 48 21.26 88 5.32 128 1.717

9 115.2 49 20.46 89 5.157 129 1.674

10 109.8 50 19.69 90 5 130 1.632

11 104.6 51 18.96 91 4.849

12 99.69 52 18.26 92 4.703

13 95.05 53 17.58 93 4.562

14 90.66 54 16.94 94 4.426

15 86.49 55 16.32 95 4.294 B(25/50)=3950K

16 82.54 56 15.73 96 4.167

17 78.79 57 15.16 97 4.045 R(90)=5KΩ±3%

18 75.24 58 14.62 98 3.927

19 71.86 59 14.09 99 3.812



2. Compressor checking Measure the resistance value of each winding by using the tester.

Position Resistance Value

ASN108D22UEZ ASM135D23UFZ ATF235D22UMT ATF310D43UMT

Blue - Red

1.57Ω(20) 1.75Ω(20) 0.75Ω(20) 0.65Ω(20)



3. IPM continuity check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N.

Digital tester Normal resistance value Digital tester Normal resistance value

(+)Red (-)Black

∞ (Several MΩ)

(+)Red (-)Black

∞ (Several MΩ) P

N U

N U V

V W

W (+)Red

4. Indoor AC Fan Motor Measure the resistance value of each winding by using the tester.

Position

Resistance Value

YKSS-68-4-15-1 (Weilng)

Black - Red

285.8Ω±8% (20)

Red - Yellow

178.5Ω±8% (20)

Yellow - Blue

178.5Ω±8% (20)

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SM Multi outdoor DM16-01.01.11-01en - Doming › cms_upload › catalog › product_files › 2069995_se… · Service manual DM16-01.01.11-01en 4 Multi DC inverter R410A. Outdoor